Fixed Assignement Toast on page.

Now opens in the newly opened tab (after it has been reopened
in the correct container). It also does not provide a toast
when removing sites from the edit assignments panel, becuase
user will most likely not be on that site when editing the
panel, so it has been throwing an error. Error should go away.

src/js/popup.js

@@ -1180,8 +1180,8 @@ Logic.registerPanel(P_CONTAINER_ASSIGNMENTS, {
         Utils.addEnterHandler(deleteButton, async () => {
           const userContextId = Logic.currentUserContextId();
           // Lets show the message to the current tab
-          const currentTab = await Utils.currentTab();
-          Utils.setOrRemoveAssignment(currentTab.id, assumedUrl, userContextId, true);
+          // const currentTab = await Utils.currentTab();
+          Utils.setOrRemoveAssignment(false, assumedUrl, userContextId, true);
           delete assignments[siteKey];
           this.showAssignedContainers(assignments);
         });